Kojima is a talented businesswoman, successful when at the age of 20 she held the position of director of a large company. In contrast, Yamada is a slow and always fails to complete the assigned work on time. On one occasion, due to personal reasons, the female secretary Sato was unable to participate in the contract signing with a partner. This was an opportunity and a challenge for employee Yamada to advance and develop himself and his work after the female director decided to send him in her place. With his efforts, the contract signing was successful, and to celebrate, they went to a party and drank a lot of alcohol. When the alcohol took effect, they went to the hotel they had previously booked, where Kojima, in a drunken state, continuously seduced Yamada, forgetting that she was married. This was too much for him to bear, and they ended up doing things that should not have happened that night.